If the tensil stress in steel reinforcement is $σ_{s t}$ area of tensile reinforcement is $A_{s t}$ depth of neutral axis is n and the effective depth is d, then the moment of resistence of an under-reinforced section is equal to

- 1
  
  $σ_{s t} x A_{s t} [\frac{d - n}{3}]$
- 2
  
  $σ_{s t} x A_{s t} [\frac{2 d - n}{3}]$
- 3
  
  $σ_{s t} x A_{s t} [\frac{3 d - n}{3}]$
- 4
  
  $σ_{s t} x A_{s t} [\frac{4 d - n}{3}]$

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